Cathodic protection (CP) is used increasingly to mitigate steel reinforcement corrosion in concrete. The performance of zinc materials as impressed current anodes was evaluated. The anode materials investigated included rolled zinc sheets, metallized zinc, and 85% Zn-15% Al. The circuit resistance and the adhesion of the anodes was monitored with polarization time. Overall performance of arc-sprayed zinc was good. However, its adhesion to the concrete surface slowly decreased as the current density, or the polarization period, increased. Penny blank sheets and metallized 85% Zn-15% Al were found unsuitable as impressed current anodes.

Subject
Bond strength, Zinc rich coatings, Voltage, Zinc anodes, Concrete surfaces, Impressed current anodes, Current densities, Interfaces, Metallic coatings, Zinc, Polarization, Concrete, Oxidation
Keywords:
adhesion, aluminum, anodes, arc spray, cathodic protection, concrete, impressed current, polarization, reinforced concrete, steel reinforcement
NACE International
1995
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